I have seen that during this state visit, both the king and the Queen and the president have a kind of little &#39;pin&#39; on their clothes. It&#39;s very small and blue or red. Has anybody an idea about the meaning of this?

Belgian King Albert II and Queen Paola are greeted by French Justice Minister Dominique Perben (3rd R), upon their. arrival 27 October 2003 at Orly airport, outside Paris. King Albert arrived for a three-day official visit to France.